diff -Nru linux-2.4.16/include/asm-mips/hardirq.h.orig linux-2.4.16/include/asm-mips/hardirq.h
--- linux-2.4.16/include/asm-mips/hardirq.h.orig	Sun Sep  9 10:43:01 2001
+++ linux-2.4.16/include/asm-mips/hardirq.h	Tue Dec  4 16:14:02 2001
@@ -43,6 +43,8 @@
 
 #define synchronize_irq()	barrier();
 
+#define release_irqlock(cpu)	do { } while (0)
+
 #else
 
 #include <asm/atomic.h>